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Octamethylcyclotetrasiloxane Structure

Octamethylcyclotetrasiloxane

Chemical Properties

Melting point 17-18 °C (lit.)
Boiling point 175-176 °C (lit.)
Density  0.956 g/mL at 25 °C (lit.)
vapor density  1 (vs air)
vapor pressure  1.32hPa at 25℃
refractive index  n20/D 1.396(lit.)
Flash point 140 °F
storage temp.  Store below +30°C.
solubility  <0.001g/l Hydrolysis
form  liquid
Specific Gravity 0.956
color  colorless
explosive limit 0.4-11.7%(V)
Viscosity 1.6mm2/s
Water Solubility  INSOLUBLE
Sensitive  Moisture Sensitive
Merck  14,6747
BRN  1787074
Dielectric constant 2.4(20℃)
InChIKey HMMGMWAXVFQUOA-UHFFFAOYSA-N
LogP 6.98 at 21.7℃
CAS DataBase Reference 556-67-2(CAS DataBase Reference)
FDA UNII CZ227117JE
NIST Chemistry Reference Cyclotetrasiloxane, octamethyl-(556-67-2)
EPA Substance Registry System Octamethylcyclotetrasiloxane (556-67-2)

Safety

Symbol(GHS)
Signal wordWarning
Hazard statements H226-H361f-H410
Precautionary statements P202-P210-P233-P240-P273-P308+P313
Hazard Codes  Xn
Risk Statements  53-62-10
Safety Statements  36/37-46-51-61
RIDADR  UN 1993 3/PG 3
WGK Germany  1
RTECS  GZ4397000
TSCA  Yes
HazardClass  3
PackingGroup  III
HS Code  29319090
Hazardous Substances Data 556-67-2(Hazardous Substances Data)
Toxicity LD50 oral in rat: 1540mg/kg
NFPA 704:
2
2 0

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